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Pex pipe oxygen barrier

View the thread, titled "Pex pipe oxygen barrier" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Fast one for the experts

Does the oxygen barrier prevent o2 from entering the pipe on lets say a negative flow or o2 out on a positive flow.or neither??
 
I don't use the stuff but from memory it was to prevent air entering the pipe through the walls. As I say, I never use it so it is only what I heard at the time they introduced it. Before that there was no barrier.

I know plastic is useful at certain times but there are too many if's and but's with it for me.

Why do you ask?
 

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